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Revealing mistake: When the elves are tying up the police officer at the station, they do so in a really quick manner. The film here is obviously sped up. You can tell this by the fact that the children playing the elves are breathing really fast.

Not a mistake, but another elf sighting within the movie. In the Parent's Day scene in Charlie's classroom, watch the boy sitting directly behind Charlie in the blue shirt. When Charlie walks back to his desk to retrieve his glass ball to show everyone, you can see the boy's pointed ears. Another note of interest is when Charlie says "my Dad is Santa Claus" and it cuts to a wide shot showing all of the kids, this kid is the only one not laughing.